I often come back to the Relevant Search book, by Doug Turnbull and John Berryman. I'm sure some of the examples are a little dated now, but most of the advice

I often come back to the Relevant Search book, by Doug Turnbull and John Berryman. I'm sure some of the examples are a little dated now, but most of the advice and approach is still sound and it's a great tour through all the things you need to consider to build a great search experience. https://www.manning.com/books/relevant-search https://www.manning.com/books/relevant-search